63 lines
1.7 KiB
Rust
63 lines
1.7 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: Apache-2.0
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use std::collections::HashSet;
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use crate::{
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id_sequence::SeqID,
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pubsub::{Dispatch, Subscribe, Unsubscribe},
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};
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/// The shared structure to keep track on subscribers.
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#[derive(Debug, Default)]
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pub(super) struct Registry {
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pub(super) subscribers: HashSet<SeqID>,
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}
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impl Subscribe<()> for Registry {
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fn subscribe(&mut self, _subs_key: (), subs_id: SeqID) {
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self.subscribers.insert(subs_id);
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}
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}
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impl Unsubscribe for Registry {
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fn unsubscribe(&mut self, subs_id: SeqID) {
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self.subscribers.remove(&subs_id);
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}
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}
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impl<MakePayload, Payload, Error> Dispatch<MakePayload> for Registry
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where
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MakePayload: FnOnce() -> Result<Payload, Error>,
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Payload: Clone,
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{
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type Item = Payload;
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type Ret = Result<(), Error>;
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fn dispatch<F>(&mut self, make_payload: MakePayload, mut dispatch: F) -> Self::Ret
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where
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F: FnMut(&SeqID, Self::Item),
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{
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if !self.subscribers.is_empty() {
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let payload = make_payload()?;
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for subs_id in &self.subscribers {
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dispatch(subs_id, payload.clone());
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}
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}
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Ok(())
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}
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}
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